@article{wu2020research,
  title     = {Research on multi-UAV communication connectivity maintenance based on dynamic programming},
  author    = {WU, YunLong and ZHANG, Bo and REN, XiaoGuang and WANG, YanZhen and YI, XiaoDong},
  journal   = {SCIENTIA SINICA Technologica},
  volume    = {50},
  number    = {5},
  pages     = {538--550},
  year      = {2020},
  publisher = {Science China Press}
}

@article{wu2,
  title     = {A rapid deployment strategy of relay unmanned aerial vehicle},
  author    = {ZHANG, Xiaomeng and YANG, Sen and SONG, Xiao and HU, Yongjiang and LI, Wenguang},
  journal   = {Journal of Beijing University of Aeronautics and Astronautics},
  year      = {2020},
  publisher = {China Academic Journals (CD Edition) Electronic Publishing House Co., Ltd}
}